Power Quality Problems
Residential community power grids are low-voltage power distribution networks, generally connected to large power grids by 10/0.4kV transformers. Most of the loads in the grid work at three-phase 480V and single-phase 220V voltage levels, mainly small-capacity loads, such as air conditioners, refrigerators, and televisions. Machines and other household appliances. Most household appliances are non-linear loads, which generate a large amount of reactive power during use.
Hazards and Influence
Reactive power is very important to the normal operation of the power grid system and load, but excessive reactive power has very prominent adverse effects. The specific manifestations are as follows:
YT Power Quality Solutions
The residential distribution network is mainly a small-capacity nonlinear load, and there are few large-capacity impact loads. Therefore, the residential distribution network generally adopts a hybrid reactive power compensation method for reactive power compensation. The hybrid dynamic reactive power compensation device is composed of two parts - a Static Var Generator SVG and a switching capacitor/reactor reactive power compensation unit. For large-capacity, fixed reactive power, configure switching capacitors for compensation; for small-capacity, fast-changing reactive power, configure corresponding static var generator capacity for compensation; hybrid dynamic reactive power compensation ensures switching accuracy At the same time as the response speed, the switching times of the capacitors are greatly reduced, the impact times on the power grid during the switching process of the capacitors are reduced, and the service life of the equipment is indirectly improved.
Some Project Examples
Projects(Some examples) |
Products |
Model |
South State Grid(Shenzhen) |
YTPQC-SVG |
|
State Grid(Zhejiang) |
Static Var Generator |
YTPQC-SVG |
Jingcheng Project |
YTPQC-AHF |
|
State Grid(Shao xing) |
Static Var Generator |
YTPQC-SVG |
Shaoxing Jianhu Project |
Static Var Generator |
YTPQC-SVG |
Shaoxing Yangjinghu 7# Project |
Static Var Generator |
YTPQC-SVG |
Shanghai Hezhuo Project |
Static Var Generator |
YTPQC-SVG |
Yongzhe Poject(Zhejiang) |
Static Var Generator |
YTPQC-SVG |
Wynn Properties Tianze House Project |
YTPQC-CSVG |
Hybrid reactive power compensation is widely used in residential distribution networks. The compensation capacity is generally configured according to 30% of the transformer capacity, and the Capacity of SVG Static Var Generator and capacitor capacity are generally configured according to user needs. The transformer capacity of a substation in a Shanghai community is 800kVA, and a 240kVAr YT-CSVG hybrid dynamic(real time) power factor compensation device is configured on site, of which the SVG capacity is 50kVAr and the capacitor capacity is 190kVAr. After the YT-CSVG hybrid dynamic reactive power compensation device, the on-site compensation effect is as shown in the figure below.
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